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Materials (Basel). 2014 Oct 29;7(11):7226-7242. doi: 10.3390/ma7117226.

Organic Field-Effect Transistors Based on a Liquid-Crystalline Polymeric Semiconductor using SU-8 Gate Dielectrics onFlexible Substrates.

Author information

1
Research Center for Microperipheric Technologies, Technische Universität Berlin, Gustav-Meyer-Allee 25, 13355 Berlin, Germany. k.tetzner@tu-berlin.de.
2
Fraunhofer Research Institution for Modular Solid State Technologies EMFT, Hansastr. 27d, 80686 Munich, Germany. indranil.bose@emft.fraunhofer.de.
3
Electronics Packaging Lab (IAVT), Technische Universität Dresden, Helmholtzstr. 10, 01069 Dresden, Germany. karlheinz.bock@tu-dresden.de.

Abstract

In this work, the insulating properties of poly(4-vinylphenol) (PVP) and SU-8 (MicroChem, Westborough, MA, USA) dielectrics are analyzed and compared with each other. We further investigate the performance behavior of organic field-effect transistors based on a semiconducting liquid-crystal polymer (LCP) using both dielectric materials and evaluate the results regarding the processability. Due to the lower process temperature needed for the SU-8 deposition, the realization of organic transistors on flexible substrates is demonstrated showing comparable charge carrier mobilities to devices using PVP on glass. In addition, a µ-dispensing procedure of the LCP on SU-8 is presented, improving the switching behavior of the organic transistors, and the promising stability data of the SU-8/LCP stack are verified after storing the structures for 60 days in ambient air showing negligible irreversible degradation of the organic semiconductor.

KEYWORDS:

liquid-crystal polymers; long-term stability; organic field-effect transistors; organic semiconductor

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